A fast-disconnecting circuit breaker

Abstract

This application relates to the technical field of circuit breakers, specifically to a fast-breaking circuit breaker, comprising a housing and a contact assembly disposed within the housing. The contact assembly includes a rotatably disposed moving contact and a fixedly disposed stationary contact. A moving contact drive arm is also rotatably disposed within the housing, used to drive the moving contact to rotate and disconnect from the stationary contact. An electromagnetic tripping assembly is also provided within the housing, comprising a drive member and a rotatably disposed transmission member. The transmission member is used to abut against the moving contact drive arm to restrict its rotation, and the drive member is used to generate magnetic force to cause the transmission member to rotate and disengage from the moving contact drive arm. This application achieves fast breaking of the circuit breaker through an innovative design of the electromagnetic tripping assembly.

Description

Technical Field

[0001] This application relates to the field of circuit breakers, and more particularly to a fast-breaking circuit breaker. Background Technology

[0002] A circuit breaker is a critical safety device used to protect electrical circuits. Its core function is to monitor the circuit status in real time and automatically disconnect the faulty circuit when abnormal currents such as overload or short circuits exceed a predetermined threshold. Through its fast and reliable disconnection action, it effectively prevents overheating of conductors, equipment damage, and fire risks, thus ensuring the safety of the power system and personnel.

[0003] Existing circuit breaker technology typically achieves disconnection operations through mechanical tripping mechanisms. The response speed, breaking capacity, and level of intelligence of these mechanisms directly affect protection effectiveness. The response speed of circuit breaker tripping mechanisms in existing technologies needs to be improved. Summary of the Invention

[0004] To improve the breaking performance of circuit breakers, this application provides a fast-breaking circuit breaker.

[0005] This application provides a fast-disconnecting circuit breaker, which adopts the following technical solution:

[0006] A fast-disconnecting circuit breaker includes a housing and a contact assembly disposed within the housing. The contact assembly includes a rotatably disposed moving contact and a fixedly disposed stationary contact. A moving contact drive arm is also rotatably disposed within the housing. The moving contact drive arm is used to drive the moving contact to rotate and disconnect from the stationary contact. An electromagnetic tripping assembly is also provided within the housing. The electromagnetic tripping assembly includes a drive member and a rotatably disposed transmission member. The transmission member is used to abut against the moving contact drive arm to limit the rotation of the moving contact drive arm. The drive member is used to generate magnetic force and cause the transmission member to rotate and disengage from the moving contact drive arm.

[0007] By adopting the above technical solution and through the innovative design of the electromagnetic tripping assembly, rapid tripping of the circuit breaker is achieved: the magnetic force generated by the driving component enables the transmission component to rotate, releasing its mechanical constraint on the moving contact drive arm, which then instantly drives the moving contact to disengage from the stationary contact. Compared with traditional mechanical tripping, this structure significantly shortens the tripping response time, especially improving the breaking efficiency of short-circuit currents, while reducing the risk of continuous arc damage.

[0008] Optionally, the electromagnetic tripping assembly further includes a rotatable rotating component, the driving component being an armature, the driving component receiving current passing through the terminal and generating magnetic force to drive the rotating component to rotate, the rotating component driving the transmission component to rotate until it disengages from the moving contact drive arm, and a reset elastic component connecting the rotating component and the housing to reset the rotating component.

[0009] By adopting the above technical solution, an armature is introduced as the core of magnetic drive, utilizing the energy of the terminal current to trigger the action, eliminating the need for an external power supply or detection sensor. The armature's magnetic force drives the rotating component to rotate, and automatic reset is achieved through a reset elastic element, ensuring rapid return to standby state after tripping. This design optimizes the energy transfer path, improves magnetic force utilization, and the reset mechanism ensures reliability during frequent operations.

[0010] Optionally, the electromagnetic tripping assembly further includes a rotatably mounted traction rod, which is used to abut against the transmission component to restrict the rotation of the transmission component. The rotating component is used to rotate to abut against the traction rod and drive the traction rod to rotate to disengage from the transmission component. An abutting elastic element is connected between the traction rod and the housing to keep the traction rod and the transmission component in abutting state. A tripping elastic element is connected between the transmission component and the housing to rotate the transmission component to disengage from the moving contact drive arm.

[0011] By adopting the above technical solution, a "two-stage release" mechanism is constructed through the synergy of the traction rod and dual elastic elements (abutment elastic element and tripping elastic element): the rotating component first releases the traction rod from locking the transmission component, and then the tripping elastic element pushes the transmission component to release the moving contact drive arm. This structure ensures stable locking under normal conditions while achieving instantaneous burst and precise control of the tripping force, avoiding false triggering and making the disconnection action more decisive.

[0012] Optionally, the driving component and rotating component are provided in multiple sets, each set of driving component and rotating component is used to correspond to a different set of wiring terminals, and each rotating component is used to abut against the same traction rod.

[0013] By adopting the above technical solution, multiple sets of driving and rotating components independently correspond to multiple sets of wiring terminals, sharing a single traction rod design. This not only meets the requirements for independent response of multiple circuits but also simplifies the structure through centralized triggering. Fault current in any circuit can drive the traction rod to release the transmission component constraint, ensuring the synchronization and systematic nature of multi-circuit protection. Simultaneously, it reduces the complexity and cost of multi-channel control, resulting in more precise tripping and better consistency.

[0014] Optionally, the traction rod has an abutment surface, and the rotating member is used to slide against the abutment surface.

[0015] By adopting the above technical solution, the contact surface on the traction rod slides into contact with the rotating component, converting the impact of collision into smooth linear displacement. This design reduces mechanical vibration and wear during the movement of the rotating component, improves the lifespan of the tripping mechanism, and maintains operational stability, especially under frequent operation or high current surges.

[0016] Optionally, the driving member has an adsorption surface, and the rotating member has an adsorption surface that can fit and contact the adsorption surface.

[0017] By adopting the above technical solution, the planar fit design between the armature adsorption surface and the adsorbed surface of the rotating component maximizes the magnetic force application area and transmission efficiency. Furthermore, when the adsorption surface and the adsorbed surface are in contact, it provides a good rotational limiting effect on the rotating component.

[0018] Optionally, a pressing hole is provided through the housing, and a pressing button is slidably disposed in the pressing hole. The pressing button is used to contact the traction rod and drive the traction rod to rotate until it disengages from the transmission component.

[0019] By adopting the above technical solution, the linkage between the button and the pull rod provides a manual emergency tripping function. Physical pressing directly drives the pull rod to disengage from the transmission component, simulating an electromagnetic tripping action. This design facilitates on-site testing and maintenance, allowing verification of the mechanical tripping function without the need for power, thus enhancing operational safety and convenience.

[0020] Optionally, the housing includes an identification circuit board and a functional module. The functional module is inserted into the housing, and the identification circuit board is electrically connected to the functional module. The identification circuit board is used to store information about the circuit breaker body and is also used to modify the information on the functional module to the information about the circuit breaker body.

[0021] By adopting the above technical solution, the cooperation between the identification circuit board and the pluggable functional modules is achieved, enabling dynamic reading and writing of circuit breaker identification information and operating parameters. The modular design supports functional upgrades (such as changes in communication protocols) without replacing the circuit breaker itself, while the information synchronization mechanism ensures that the system automatically identifies replacement parts, significantly improving the efficiency of intelligent management.

[0022] Optionally, the housing also includes an arc-extinguishing chamber, and an exhaust port is provided through the surface of the housing. The exhaust port is located on the side of the arc-extinguishing chamber away from the contact assembly, and the housing is provided with an exhaust channel communicating with the arc-extinguishing chamber and the exhaust port.

[0023] By adopting the above technical solution, after the arc generated during circuit breaker interruption is extinguished in the arc-extinguishing chamber, the resulting high-temperature, high-pressure hot gas flow is discharged from the casing through the exhaust port via the exhaust channel. The directional exhaust channel guides the high-temperature gas from the arc-extinguishing chamber to a dedicated exhaust port away from the contact assembly, forcibly guiding the arc products to be discharged along a preset path. This structure effectively isolates the internal components from secondary damage caused by the arc, while preventing the backflow of high-temperature gas from causing reignition, thus improving the breaking safety and casing durability.

[0024] Optionally, an exhaust hole communicating with the exhaust channel is also provided on the surface of the housing, and the exhaust hole is located between the arc-extinguishing chamber and the exhaust port.

[0025] By adopting the above technical solution, when the hot gas flows in the exhaust channel, most of the hot gas is discharged outside the shell through the exhaust port, and a small portion of the hot gas is discharged outside the shell through the exhaust hole. An auxiliary exhaust hole is added between the arc-extinguishing chamber and the main exhaust port, forming a stepped pressure relief channel. The main exhaust port centrally discharges high-temperature gas, while the auxiliary exhaust hole diverts the initial pressure peak, reducing the risk of gas backflow. The two-stage pressure relief design optimizes airflow dynamics efficiency and further suppresses arc reignition.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. Through the innovative design of the electromagnetic tripping assembly, the circuit breaker achieves rapid disconnection, significantly shortens the tripping response time, and significantly improves the breaking efficiency of short-circuit current, while reducing the risk of continuous arc damage.

[0028] 2. While ensuring stable locking under normal conditions, it achieves instantaneous burst and precise control of tripping force, avoiding false triggering and making the disconnection action more decisive;

[0029] 3. The design of multiple sets of armatures and rotating parts independently corresponding to multiple sets of terminals, while sharing a single traction rod, not only meets the requirements of independent response of multiple circuits, but also simplifies the structure through centralized triggering. Attached Figure Description

[0030] Figure 1 This is a structural diagram of this application.

[0031] Figure 2 This is a side sectional view of this application.

[0032] Figure 3 This is a schematic diagram of the moving contact drive arm and electromagnetic tripping assembly that highlight the transmission components in this application.

[0033] Figure 4 This is a schematic diagram of the moving contact drive arm and electromagnetic tripping assembly that highlight the contact surface in this application.

[0034] Figure 5 This is a schematic diagram of the structure of the driving component and the rotating component in this application.

[0035] Figure 6 This is a schematic diagram of the traction rod in this application.

[0036] Figure 7 yes Figure 3 Enlarged view of section B in the middle.

[0037] Figure 8 This is a structural schematic diagram of the transmission component in this application.

[0038] Figure 9 yes Figure 2 Enlarged view of point A in the middle.

[0039] Explanation of reference numerals in the attached drawings: 1. Housing; 11. Pressing hole; 12. Exhaust port; 13. Exhaust channel; 14. Exhaust hole; 2. Contact assembly; 21. Moving contact; 22. Stationary contact; 3. Moving contact drive arm; 31. Limiting part; 4. Electromagnetic tripping assembly; 41. Driving component; 411. Adsorption surface; 412. Armature body; 413. Adsorption part; 42. Transmission component; 421. Abutting part; 422. Limiting part; 43. Rotating component; 431. Adsorption surface; 432. Adsorption part; 433. Pushing part; 44. Traction rod; 441. Abutting surface; 442. Pushing part; 443. Abutting part; 5. Reset elastic element; 6. Abutting elastic element; 7. Tripping elastic element; 8. Press button; 9. Identification circuit board; 100. Functional module; 110. Arc extinguishing chamber. Detailed Implementation

[0040] The following is combined with Figure 1-9 This application is described in further detail.

[0041] This application discloses a fast-disconnecting circuit breaker. (Refer to...) Figure 1 and Figure 2 and Figure 3 The fast-disconnecting circuit breaker includes a housing 1 and a contact assembly 2 installed within the housing 1. The contact assembly 2 includes a moving contact 21 rotatably mounted within the housing 1 and a stationary contact 22 fixedly mounted within the housing 1. The moving contact 21 is used to rotate to contact or disconnect with the stationary contact 22. A moving contact drive arm 3 is also rotatably mounted within the housing 1, used to drive the moving contact 21 to rotate and disconnect from the stationary contact 22. An electromagnetic trip assembly 4 is also installed within the housing 1. The electromagnetic trip assembly 4 includes a drive member 41 fixedly mounted within the housing 1 and a transmission member 42 rotatably mounted within the housing 1. The transmission member 42 is used to abut against the moving contact drive arm 3 to limit its rotation. The drive member 41 generates magnetic force and causes the transmission member 42 to rotate and disengage from the moving contact drive arm 3.

[0042] Reference Figure 2 and Figure 4Multiple driving components 41 are provided, each corresponding to one of the multiple sets of terminals on the circuit breaker. In this embodiment, three driving components 41 are provided. The driving component 41 is an armature, which includes an armature body 412 and two adsorption parts 413. The two adsorption parts 413 are located at both ends of the armature body 412 and are formed by bending the ends of the armature body 412. The thickness direction of the housing 1 is set to the vertical direction, and the width direction of the housing 1 is set to the left and right direction. The armature body 412 is located below the terminals, and the adsorption parts 413 are located on the left and right sides of the terminals. When current passes through the terminals, the driving component 41 can generate magnetic force. An inclined adsorption surface 411 is formed on the upper surface of the adsorption part 413, and the adsorption surface 411 is inclined in a direction that gets higher and lower.

[0043] Reference Figure 4 and Figure 5 The electromagnetic tripping assembly 4 also includes multiple rotating members 43 rotatably mounted within the housing 1. Each rotating member 43 corresponds one-to-one with a driving member 41, and the rotating member 43 rotates above the driving member 41. Each rotating member 43 includes two adsorbed portions 432 corresponding one-to-one with the adsorption portions 413. An inclined adsorption surface 431 is formed on the lower surface of each adsorption portion 432, with the adsorption surface 431 inclined towards the upward and backward direction. The rotation axis of the rotating member 43 is located above the adsorption surface 431. A reset elastic member 5 connects the rotating member 43 to the housing 1, causing the rotating member 43 to rotate until the adsorption surface 431 is away from the adsorption surface 411. When a short circuit or overload occurs, the driving member 41 generates a sufficiently large magnetic force to adsorb the rotating member 43, causing the rotating member 43 to overcome the elastic force of the reset elastic member 5 and rotate until the adsorption surface 431 contacts and adheres to the adsorption surface 411.

[0044] Reference Figure 4 The rotating member 43 also includes a pushing part 433, which is located on the side of the rotating member 43 away from the adsorbed part 432.

[0045] Reference Figure 4 and Figure 6 The electromagnetic tripping assembly 4 also includes a traction rod 44 rotatably mounted within the housing 1, located between the moving contact drive arm 3 and the pushing part 433. The traction rod 44 includes a pushed part 442 with an abutting surface 441 formed thereon. Multiple pushing parts 433 are used to abut against the abutting surface 441 on the pushed part 442 of the same traction rod 44. A rotating member 43 is used to push the traction rod 44 to rotate. An abutting elastic member 6 connects the traction rod 44 to the housing 1. When the drive member 41 attracts the rotating member 43, causing the rotating member 43 to rotate, the pushing part 433 rotates to abut against the pushed part 442 and overcomes the elastic force of the abutting elastic member 6 to push the pushed part 442, thereby driving the traction rod 44 to rotate.

[0046] Reference Figure 3 and Figure 7 The traction rod 44 also includes an abutment part 443, which is located on the side of the rotation axis of the traction rod 44 away from the pushed part 442.

[0047] Reference Figure 3 and Figure 7 The transmission member 42 is located between the moving contact drive arm 3 and the abutment part 443. The transmission member 42 includes an abutment part 421, which is used to abut against the abutment part 443.

[0048] Reference Figure 6 and Figure 7 and Figure 8 A release elastic element 7 connects the transmission component 42 to the housing 1. The abutment elastic element 6 keeps the traction rod 44 in contact with the abutment portion 443 and the abutted portion 421, while the release elastic element 7 keeps the transmission component 42 in contact with the abutted portion 421 and the abutment portion 443, thus restricting the rotation of the transmission component 42 and the traction rod 44. When the rotating component 43 pushes the traction rod 44 to rotate, the traction rod 44 rotates until the abutment portion 443 disengages from the abutted portion 421, and the transmission component 42 rotates under the elastic force of the release elastic element 7.

[0049] Reference Figure 7 and Figure 8 The transmission member 42 also includes a limiting part 422, which is located on the side of the rotation axis of the transmission member 42 away from the contacted part 421.

[0050] Reference Figure 3 and Figure 7 The moving contact drive arm 3 includes a limiting part 31, and a limiting part 422 is used to abut against the limiting part 31, thereby restricting the rotation of the moving contact drive arm 3. When the traction rod 44 rotates until the abutting part 443 disengages from the abutting part 421, the transmission member 42 rotates under the elastic force of the release elastic member 7 until the limiting part 422 disengages from the limiting part 31.

[0051] Reference Figure 4 and Figure 9 A pressing hole 11 extending vertically and communicating with the inner cavity of the housing 1 is provided through the upper surface of the housing 1. A pressing button 8 is slidably installed in the pressing hole 11 in the vertical direction. The pressing button 8 is used to slide downward and abut against the traction rod 44, overcoming the elastic force of the abutting elastic member 6 and pushing the traction rod 44 to rotate until the abutting part 443 disengages from the abutted part 421.

[0052] Reference Figure 6The housing 1 also houses a fixed identification circuit board 9 and a pluggable functional module 100. When the functional module 100 is plugged into the housing 1, it is electrically connected to the identification circuit board 9. The identification circuit board 9 is used to store information about the circuit breaker body and to modify the information on the functional module 100 to reflect the information about the circuit breaker body.

[0053] Reference Figure 2 An arc-extinguishing chamber 110 is also fixedly installed inside the housing 1. An exhaust port 12 communicating with the inner cavity is opened through the surface of the housing 1, and the exhaust port 12 is located on the side of the arc-extinguishing chamber 110 away from the contact assembly 2. An exhaust channel 13 is also opened inside the housing 1, one end of the exhaust channel 13 communicating with the arc-extinguishing chamber 110, and the other end communicating with the exhaust port 12.

[0054] Reference Figure 2 The lower surface of the housing 1 is also provided with an exhaust hole 14 that communicates with multiple exhaust channels 13. The exhaust hole 14 is located between the arc-extinguishing chamber 110 and the exhaust port 12, and the multiple exhaust holes 14 are arranged along the extension direction of the exhaust channel 13.

[0055] The implementation principle of a fast-disconnecting circuit breaker in this application embodiment is as follows: When the circuit breaker is working normally, a normal current flows through the terminals. The magnetic force generated by the drive member 41 is insufficient to overcome the elastic force of the reset elastic member 5 to attract the rotating member 43 and make it rotate. At this time, the rotating member 43 does not contact the traction rod 44. The traction rod 44 and the transmission member 42 contact each other under the elastic force of the contact elastic member 6 and the trip elastic member 7, respectively, so that both remain in a stationary state. At the same time, the transmission member 42 contacts the moving contact drive arm 3, restricting the rotation of the moving contact drive arm 3.

[0056] When the circuit breaker is short-circuited or overloaded, a large current flows through the terminals, causing the drive component 41 to generate a large magnetic force, which attracts the rotating component 43. This causes the rotating component 43 to overcome the elastic force of the reset elastic component 5 and rotate until it contacts the traction rod 44. It also overcomes the elastic force of the contact elastic component 6 and pushes the traction rod 44 to rotate until it disengages from the transmission component 42. Under the action of the release elastic component 7, the transmission component 42 rotates until it disengages from the moving contact drive arm 3. The moving contact drive arm 3 rotates and drives the moving contact 21 to rotate until it disconnects from the stationary contact 22.

[0057] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A fast-disconnecting circuit breaker, comprising a housing (1) and a contact assembly (2) disposed within the housing (1), the contact assembly (2) comprising a rotatably disposed moving contact (21) and a fixedly disposed stationary contact (22), and a moving contact drive arm (3) rotatably disposed within the housing (1), the moving contact drive arm (3) being used to drive the moving contact (21) to rotate until it disconnects from the stationary contact (22), characterized in that: The housing (1) is further provided with an electromagnetic tripping assembly (4). The electromagnetic tripping assembly (4) includes a driving member (41) and a rotatably arranged transmission member (42). The transmission member (42) is used to abut against the moving contact driving arm (3) to restrict the rotation of the moving contact driving arm (3). The driving member (41) is used to generate magnetic force and cause the transmission member (42) to rotate until it disengages from the moving contact driving arm (3). The electromagnetic tripping assembly (4) also includes a rotatably arranged rotating member (43). The driving member (41) is an armature. The driving member (41) is used to receive the current passing through the terminal and generate magnetic force to drive the rotating member (43) to rotate. The rotating member (43) is used to drive the transmission member (42) to rotate until it disengages from the moving contact driving arm (3). A reset elastic element (5) is connected between the moving part (43) and the housing (1) to reset the rotating part (43). The electromagnetic tripping assembly (4) also includes a rotatably configured traction rod (44). The traction rod (44) is used to abut against the transmission part (42) to restrict the rotation of the transmission part (42). The rotating part (43) is used to rotate to abut against the traction rod (44) and drive the traction rod (44) to rotate to disengage from the transmission part (42). A contact elastic element (6) is connected between the traction rod (44) and the housing (1) to keep the traction rod (44) and the transmission part (42) in a contact state. A tripping elastic element (7) is connected between the transmission part (42) and the housing (1) to rotate the transmission part (42) to disengage from the moving contact drive arm (3).

2. The fast-disconnecting circuit breaker according to claim 1, characterized in that: The driving component (41) and rotating component (43) are provided in multiple sets. Each set of driving component (41) and rotating component (43) is used to correspond to a different set of wiring terminals. Each rotating component (43) is used to abut against the same traction rod (44).

3. The fast-disconnecting circuit breaker according to claim 1, characterized in that: The traction rod (44) has a contact surface (441) formed thereon, and the rotating member (43) is used to slide against the contact surface (441).

4. The fast-disconnecting circuit breaker according to claim 1, characterized in that: The driving member (41) has an adsorption surface (411) formed thereon, and the rotating member (43) has an adsorption surface (431) that can fit and contact with the adsorption surface (411).

5. The fast-disconnecting circuit breaker according to claim 1, characterized in that: A pressing hole (11) is provided through the housing (1). A pressing button (8) is slidably provided in the pressing hole (11). The pressing button (8) is used to contact the traction rod (44) and drive the traction rod (44) to rotate until it disengages from the transmission component (42).

6. The fast-disconnecting circuit breaker according to claim 1, characterized in that: The housing (1) is provided with an identification circuit board (9) and a function module (100). The function module (100) is inserted into the housing (1). The identification circuit board (9) can be electrically connected to the function module (100). The identification circuit board (9) is used to store information of the circuit breaker body. The identification circuit board (9) is also used to modify the information on the function module (100) to the information of the circuit breaker body.

7. The fast-disconnecting circuit breaker according to claim 1, characterized in that: The housing (1) is also provided with an arc-extinguishing chamber (110), and an exhaust port (12) is also provided through the surface of the housing (1). The exhaust port (12) is located on the side of the arc-extinguishing chamber (110) away from the contact assembly (2). The housing (1) is provided with an exhaust channel (13) that communicates with the arc-extinguishing chamber (110) and the exhaust port (12).

8. The fast-disconnecting circuit breaker according to claim 7, characterized in that: The surface of the housing (1) is also provided with an exhaust hole (14) that communicates with the exhaust channel (13). The exhaust hole (14) is located between the arc-extinguishing chamber (110) and the exhaust port (12).

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